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1 /* vms_pp - preprocess emacs files in such a way that they can be
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2 * compiled on VMS without warnings.
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3 * Copyright (C) 1986 Free Software Foundation, Inc.
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4
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5 This file is part of XEmacs.
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6
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7 XEmacs is free software; you can redistribute it and/or modify it
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8 under the terms of the GNU General Public License as published by the
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9 Free Software Foundation; either version 2, or (at your option) any
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10 later version.
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11
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12 XEmacs is distributed in the hope that it will be useful, but WITHOUT
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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15 for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with XEmacs; see the file COPYING. If not, write to
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19 the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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20 Boston, MA 02111-1307, USA. */
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21
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22 /* Synched up with: Not synched with FSF. */
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23
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24 *
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25 * Usage:
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26 * vms_pp infile outfile
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27 * implicit inputs:
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28 * The file "vms_pp.trans" has the names and their translations.
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29 * description:
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30 * Vms_pp takes the input file and scans it, replacing the long
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31 * names with shorter names according to the table read in from
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32 * vms_pp.trans. The line is then written to the output file.
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33 *
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34 * Additionally, the "#undef foo" construct is replaced with:
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35 * #ifdef foo
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36 * #undef foo
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37 * #endif
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38 *
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39 * The construct #if defined(foo) is replaced with
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40 * #ifdef foo
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41 * #define foo_VAL 1
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42 * #else
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43 * #define foo_VAL 0
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44 * #endif
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45 * #define defined(XX) XX_val
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46 * #if defined(foo)
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47 *
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48 * This last contruction only works on single line #if's and takes
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49 * advantage of a questionable C pre-processor trick. If there are
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50 * comments within the #if, that contain "defined", then this will
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51 * bomb.
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52 */
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53 #include <stdio.h>
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54
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55 #define Max_table 100
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56 #define Table_name "vms_pp.trans"
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57 #define Word_member \
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58 "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_$"
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59
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60 static FILE *in,*out; /* read from, write to */
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61 struct item { /* symbol table entries */
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62 char *name;
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63 char *value;
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64 };
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65 static struct item name_table[Max_table]; /* symbol table */
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66 static int defined_defined = 0; /* small optimization */
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67
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68 main(argc,argv) int argc; char **argv; {
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69 char buffer[1024];
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70
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71 if(argc != 3) { /* check argument count */
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72 fprintf(stderr,"usage: vms_pp infile outfile");
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73 exit();
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74 }
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75 init_table(); /* read in translation table */
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76
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77 /* open input and output files
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78 */
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79 if((in = fopen(argv[1],"r")) == NULL) {
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80 fprintf(stderr,"vms_pp: unable to open file '%s'",argv[1]);
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81 exit();
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82 }
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83 if((out = fopen(argv[2],"w")) == NULL) {
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84 fprintf(stderr,"vms_pp: unable to create file '%s'",argv[2]);
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85 exit();
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86 }
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87
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88 while(fgets(buffer,1023,in) != NULL) { /* loop through buffer until end */
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89 process_line(buffer); /* process the line */
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90 fputs(buffer,out); /* write out the line */
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91 }
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92 }
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93
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94 /* buy - allocate and copy a string
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95 */
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96 static char *buy(str) char *str; {
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97 char *temp;
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98
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99 if(!(temp = malloc(strlen(str)+1))) {
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100 fprintf(stderr,"vms_pp: can't allocate memory");
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101 exit();
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102 }
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103 strcpy(temp,str);
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104 return temp;
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105 }
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106
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107 /* gather_word - return a buffer full of the next word
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108 */
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109 static char *gather_word(ptr,word) char *ptr, *word;{
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110 for(; strchr(Word_member,*ptr); ptr++,word++)
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111 *word = *ptr;
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112 *word = 0;
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113 return ptr;
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114 }
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115
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116 /* skip_white - skip white space
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117 */
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118 static char *skip_white(ptr) char *ptr; {
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119 while(*ptr == ' ' || *ptr == '\t')
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120 ptr++;
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121 return ptr;
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122 }
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123
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124 /* init_table - initialize translation table.
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125 */
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126 init_table() {
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127 char buf[256],*ptr,word[128];
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128 FILE *in;
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129 int i;
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130
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131 if((in = fopen(Table_name,"r")) == NULL) { /* open file */
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132 fprintf(stderr,"vms_pp: can't open '%s'",Table_name);
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133 exit();
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134 }
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135 for(i = 0; fgets(buf,255,in) != NULL;) { /* loop through lines */
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136 ptr = skip_white(buf);
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137 if(*ptr == '!') /* skip comments */
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138 continue;
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139 ptr = gather_word(ptr,word); /* get long word */
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140 if(*word == 0) { /* bad entry */
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141 fprintf(stderr,"vms_pp: bad input line '%s'\n",buf);
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142 continue;
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143 }
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144 name_table[i].name = buy(word); /* set up the name */
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145 ptr = skip_white(ptr); /* skip white space */
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146 ptr = gather_word(ptr,word); /* get equivalent name */
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147 if(*word == 0) { /* bad entry */
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148 fprintf(stderr,"vms_pp: bad input line '%s'\n",buf);
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149 continue;
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150 }
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151 name_table[i].value = buy(word); /* and the equivalent name */
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152 i++; /* increment to next position */
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153 }
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154 for(; i < Max_table; i++) /* mark rest as unused */
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155 name_table[i].name = 0;
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156 }
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157
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158 /* process_line - do actual line processing
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159 */
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160 process_line(buf) char *buf; {
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161 char *in_ptr,*out_ptr;
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162 char word[128],*ptr;
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163 int len;
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164
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165 check_pp(buf); /* check for preprocessor lines */
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166
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167 for(in_ptr = out_ptr = buf; *in_ptr;) {
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168 if(!strchr(Word_member,*in_ptr)) /* non alpha-numeric? just copy */
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169 *out_ptr++ = *in_ptr++;
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170 else {
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171 in_ptr = gather_word(in_ptr,word); /* get the 'word' */
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172 if(strlen(word) > 31) /* length is too long */
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173 replace_word(word); /* replace the word */
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174 for(ptr = word; *ptr; ptr++,out_ptr++) /* copy out the word */
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175 *out_ptr = *ptr;
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176 }
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177 }
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178 *out_ptr = 0;
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179 }
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180
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181 /* check_pp - check for preprocessor lines
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182 */
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183 check_pp(buf) char *buf; {
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184 char *ptr,*p;
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185 char word[128];
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186
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187 ptr = skip_white(buf); /* skip white space */
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188 if(*ptr != '#') /* is this a preprocessor line? */
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189 return; /* no, just return */
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190
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191 ptr = skip_white(++ptr); /* skip white */
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192 ptr = gather_word(ptr,word); /* get command word */
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193 if(!strcmp("undef",word)) { /* undef? */
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194 ptr = skip_white(ptr);
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195 ptr = gather_word(ptr,word); /* get the symbol to undef */
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196 fprintf(out,"#ifdef %s\n",word);
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197 fputs(buf,out);
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198 strcpy(buf,"#endif");
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199 return;
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200 }
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201 if(!strcmp("if",word)) { /* check for if */
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202 for(;;) {
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203 ptr = strchr(ptr,'d'); /* look for d in defined */
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204 if(!ptr) /* are we done? */
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205 return;
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206 if(strchr(Word_member,*(ptr-1))){ /* at beginning of word? */
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207 ptr++; continue; /* no, continue looking */
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208 }
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209 ptr = gather_word(ptr,word); /* get the word */
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210 if(strcmp(word,"defined")) /* skip if not defined */
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211 continue;
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212 ptr = skip_white(ptr); /* skip white */
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213 if(*ptr != '(') /* look for open paren */
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214 continue; /* error, continue */
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215 ptr++; /* skip paren */
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216 ptr = skip_white(ptr); /* more white skipping */
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217 ptr = gather_word(ptr,word); /* get the thing to test */
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218 if(!*word) /* null word is bad */
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219 continue;
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220 fprintf(out,"#ifdef %s\n",word); /* generate the code */
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221 fprintf(out,"#define %s_VAL 1\n",word);
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222 fprintf(out,"#else\n");
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223 fprintf(out,"#define %s_VAL 0\n",word);
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224 fprintf(out,"#endif\n");
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225 if(!defined_defined) {
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226 fprintf(out,"#define defined(XXX) XXX/**/_VAL\n");
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227 defined_defined = 1;
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228 }
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229 }
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230 }
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231 }
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232
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233 /* replace_word - look the word up in the table, and replace it
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234 * if a match is found.
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235 */
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236 replace_word(word) char *word; {
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237 int i;
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238
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239 for(i = 0; i < Max_table && name_table[i].name; i++)
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240 if(!strcmp(word,name_table[i].name)) {
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241 strcpy(word,name_table[i].value);
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242 return;
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243 }
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244 fprintf(stderr,"couldn't find '%s'\n",word);
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245 }
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